Asian shares rose Monday and oil prices extended gains on worries that escalating Iran-Israel tensions could disrupt the flow of crude around the world. U.S. benchmark crude oil added 71 cents to $73.

Oil prices were volatile on Monday, after surging 7% on Friday, as renewed strikes by Israel and Iran over the weekend increased concerns that the battle could widen across the region and significantly disrupt oil exports from the Middle East.

U.S. oil prices already jumped last week, which could cause prices at the pump to rise about 20 cents a gallon in the coming weeks, according to one estimate.